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Note 5 - Permit and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Schedule of Intangible Assets [Table Text Block] |
Permit (amount in thousands) |  | Treatment |
Balance as of December 31, 2014 |  | $ | 16,709 |
PCB permit amortized (1) |  |  | (55 | )
Permit in progress |  |  | 107 |
Balance as of December 31, 2015 |  |  | 16,761 |
PCB permit amortized (1) |  |  | (55 | )
Permit in progress |  |  | 56 |
Permit impairment for M&EC subsidiary |  |  | (8,288 | )
Balance as of December 31, 2016 |  | $ | 8,474 |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
|  |  |  |  |  |  | December 31, 2016 |  |  | December 31, 2015 |
|  | Useful Lives (Years) |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Carrying Amount |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Carrying Amount |
Intangibles (amount in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Patent |  | 3 | - | 17 |  |  | $ | 577 |  |  | $ | (274 | ) |  | $ | 303 |  |  | $ | 539 |  |  | $ | (203 | ) |  | $ | 336 |
Software |  |  | 3 |  |  |  |  | 405 |  |  |  | (383 | ) |  |  | 22 |  |  |  | 395 |  |  |  | (364 | ) |  |  | 31 |
Customer relationships |  |  | 12 |  |  |  |  | 3,370 |  |  |  | (1,974 | ) |  |  | 1,396 |  |  |  | 3,370 |  |  |  | (1,671 | ) |  |  | 1,699 |
Permit |  |  | 10 |  |  |  |  | 545 |  |  |  | (428 | ) |  |  | 117 |  |  |  | 545 |  |  |  | (373 | ) |  |  | 172 |
Total |  |  |  |  |  |  | $ | 4,897 |  |  | $ | (3,059 | ) |  | $ | 1,838 |  |  | $ | 4,849 |  |  | $ | (2,611 | ) |  | $ | 2,238 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] |
Year |  | Amount (In thousands) |
2017 |  | $ | 372 |
2018 |  |  | 337 |
2019 |  |  | 254 |
2020 |  |  | 218 |
2021 |  |  | 198 |
|  | $ | 1,379 |

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